• BS ISO/IEC 8208:1995

    Superseded A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

    Information technology. Data communications. X.25 Packet Layer Protocol for Data Terminal Equipment

    Available format(s):  Hardcopy, PDF

    Superseded date:  15-05-2001

    Language(s):  English

    Published date:  15-01-1996

    Publisher:  British Standards Institution

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    Table of Contents - (Show below) - (Hide below)

    1. Scope
    2. Normative references
       2.1 Identical Recommendations / International
           Standards
       2.2 Paired Recommendations / International
           Standards equivalent in technical content
       2.3 Additional references
    3. General considerations
       3.1 Compatibility with versions of
           Recommendation X.25
       3.2 Environments
       3.3 Differences in DTE/DTE and DTE/DCE
           operation
       3.4 Operation over circuit-switched connections
       3.5 Provision of the OSI Network Service
       3.6 External Packet Layer interactions
       3.7 Logical channels
       3.8 Packet Layer entity
       3.9 Packet types
       3.10 Procedures for initialization
    4. Procedures for restart
       4.1 Originating a restart request
       4.2 Receiving a restart indication
       4.3 Restart collision
       4.4 Restart confirmation
       4.5 Determining "DTE" or "DCE" characteristics
    5. Procedures for Virtual Call setup and clearing
       5.1 Ready state
       5.2 Procedures for Virtual Call setup
       5.3 Rejecting a call
       5.4 Aborting a call request
       5.5 Procedures for Virtual Call clearing
    6. Procedures for data and interrupt transfer
       6.1 States for data and interrupt transfer
       6.2 Maximum User Data Field length of DATA packets
       6.3 Delivery Confirmation bit
       6.4 More Data mark
       6.5 Complete packet sequence
       6.6 Qualifier bit
       6.7 Fragmentation and reassembly of messages
       8.8 Procedures for interrupt
       6.9 Transit delay of DATA packets
    7. Procedures for flow control
       7.1 Flow control
       7.2 Throughput characteristics and throughput
           classes
    8. Procedures for reset
       8.1 Originating a reset request
       8.2 Receiving a reset indication
       8.3 Reset collision
       8.4 Reset confirmation
    9. Effects of clear, reset, and restart procedures
       on the transfer of packets
    10.Effects of Layers 1 and 2 on the Packet Layer
    11.Error handling
       11.1 The DIAGNOSTIC packet
       11.2 Nonreceipt of window-rotation information
       11.3 Receipt of erroneous DATA packets
    12.Packet formats
       12.1 General
       12.2 Call setup and call clearing packets
       12.3 DATA and interrupt packets
       12.4 Flow control packets
       12.5 Reset packets
       12.6 Restart packets
       12.7 DIAGNOSTIC packet
       12.8 REJECT packet
       12.9 Registration packets
    13.Procedures for optional user facilities
       13.1 On-line Facility Registration
       13.2 Extended Packet Sequence Numbering
       13.3 D-bit Modification
       13.4 Packet Retransmission
       13.5 Incoming Calls Barred
       13.6 Outgoing Calls Barred
       13.7 One-way Logical Channel Outgoing
       13.8 One-way Logical Channel Incoming
       13.9 Nonstandard Default Packet Sizes
       13.10 Nonstandard Default Window Sizes
       13.11 Default Throughput Classes Assignment
       13.12 Flow Control Parameter Negotiation
       13.13 Throughput Class Negotiation
       13.14 Closed User Group related facilities
       13.15 Bilateral Closed User Group related
             facilities
       13.16 Fast Select
       13.17 Fast Select Acceptance
       13.18 Reverse Charging
       13.19 Reverse Charging Acceptance
       13.20 Local Charging Prevention
       13.21 Network User Identification (NUI) related
             facilities
       13.22 Charging Information
       13.23 ROA related facilities
       13.24 Hunt Group
       13.25 Call Redirection and Call Deflection related
             facilities
       13.26 Called Line Address Modified Notification
       13.27 Transit Delay Selection and Indication
       13.28 Alternative Addressing related facilities
       13.29 Reference Number
    14.Procedures for optional ITU-T specified DTE
       facilities
       14.1 Calling Address Extension
       14.2 Called Address Extension
       14.3 Minimum Throughput Class Negotiation
       14.4 End-to-End Transit Delay Negotiation
       14.5 Priority
       14.6 Protection
       14.7 Expedited Data Negotiation
    15.Format for Facility Field in call setup/clearing
       packets
       15.1 General
       15.2 Coding of the Facility Field for optional user
            facilities
       15.3 Coding of the Facility Field for ITU-T
            specified DTE facilities
    16.Format for Registration Field registration packets
       16.1 General
       16.2 Coding of the Registration Field for
            registration facilities
    17.Diagnostic codes
    18.Timers and retransmission counts
    19.State diagrams
    20.State tables
    21.Conformance
       21.1 Static conformance
       21.2 Protocol Implementation Conformance Statement
       21.3 Dynamic conformance
    Annexes
    A Private networks
    B PICS Proforms
    C Differences between various editions of ISO/IEC 8208
    D Abbreviations

    Abstract - (Show below) - (Hide below)

    Describes the procedures, formats and facilities at the Packet Layer for Data Terminal Equipment operating in conformance with CCITT Recommendation X.25. Both Virtual Call and Permanent Virtual Circuit modes of operation are covered. The Packet Layer protocol specified can be used in both Open Systems Interconnection (OSI) and non-OSI environments. Covers private networks that use CCITT Recommendation X.25 to connect to packet-switched public data networks. It should be noted that this International Standard and CCITT Recommendation X.25 as it applies to DTEs are different in scope.

    General Product Information - (Show below) - (Hide below)

    Committee IST/6
    Development Note DRAFT FOR COMMENT 93/641175 DC
    Document Type Standard
    Publisher British Standards Institution
    Status Superseded
    Supersedes

    Standards Referenced By This Book - (Show below) - (Hide below)

    BS EN 60870-6-601:1995 Telecontrol equipment and systems. Telecontrol protocols compatible with ISO standards and ITU-T recommendations Functional profile for providing the connection-oriented transport service in end system connected via permanent access to a packet switched data network
    BS EN 60870-6-2:1996 Telecontrol equipment and systems. Telecontrol protocols compatible with ISO standards and ITU-T recommendations Use of basic standards (OSI layers 1-4)

    Standards Referencing This Book - (Show below) - (Hide below)

    ISO/IEC 10039:1991 Information technology — Open Systems Interconnection — Local area networks — Medium Access Control (MAC) service definition
    ISO/IEC TR 13532:1995 Information technology Telecommunications and information exchange between systems Protocol combinations to provide and support the OSI Network Service
    ISO/IEC TR 10029:1989 Information technology — Telecommunications and information exchange between systems — Operation of an X.25 interworking unit
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